Challengers of the Unknown # 40

Story 2: "The Super Powers of the Challengers"

After a flying machine snatches a railroad boxcar, the Challengers find it abandoned and emptied of its gold shipment. When they hear about something that plunged into the ocean, they follow below the water, but barely avoid being sunk. Ace uses a jet pack to trail the flying machine and Red hits it with carbon dioxide from his electro-suit, but the ship dives again. Prof and Rocky dive after the machine and Rocky tears it open, forcing it to surface. The Challs subdue and turn over the thugs manning the “flying amphib,” a stolen air-sea rescue craft, to the authorities.